[vtkusers] Sphere with reticle

[David.Pont at ensisjv.com]

James Kyle <krunk7 at gmail.com> wrote on 25/10/2007 11:25:57:

> Thank you for your reply,
>
> Here's the idea, I have a plain sphere being rendered. The sphere
> will move on 6 DoF (got some input for that). What I need is some
> sort of visual indicator that the sphere has moved. I was thinking a
> simple black cross hairs on the sphere surface would do the trick.
>
> I checked out the vtkBoxWidget, but it looks a bit overkill with
> emphasis on user manipulation and interaction.
>
> I've attached a file to show the simplicity of what I'm trying to
> describe...cept the attachment is 2d image rather then 3D sphere.

How about a sphere rendered with transparency (say opacity 0.2), then
polydata with 2 (or 3) lines inside crossing at the sphere midpoint? Could
increase line width or use tube filter to give the lines more weight. This
would also have the benefit of not obscuring your main dataset too much,
and avoids creating and mapping textures.

  Dave P

>
>
> [image removed] -james
> On Oct 24, 2007, at 11:33 AM, Anka Kochanowska wrote:
>
> > I'm not quite sure how you want to place a reticle. Maybe look at
> > the code of vtkBoxWidget?
> > Anka
> >
> > James Kyle wrote:
> >
> >> I've been struggling with this for a while. I need to make a
> >> sphere  with reticle. I have no idea how to do this in vtk (sphere
> >> is easy,  reticle...stuck). I've also tried making my own texture
> >> map in gimp,  but it never comes out just right.
> >>
> >> Thanks for any help in advance,
> >>
> >> James Kyle
> >>
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